        // 轮播图
        const banner = document.querySelector('.banner-img').querySelector('ul');
        let index = 0;
        setInterval(bannerChange,3000);
        function bannerChange(){
            index++;
            if(index==3)index=0;
            banner.style.transform = `translateX(${index * -93.6}vw)`;
            banner.style.transition = 'all 0.3s';
        }